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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different car >> Section 436 (Hybrid Control System (Li-Ion W/ Pa10) - Diagnostic Codes (2 Of 3)) >> HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10) >> DTC P1CCC-49: DC/DC Converter Internal Electronic Failure [09/2022 - ] >> Procedure

DTC P1CCC-49: DC/DC Converter Internal Electronic Failure [09/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Corolla, 2024 Toyota Corolla, and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE (DC/DC) 

    See step  1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 

    See step  3

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. CHECK FUSE (PCU NO. 2) 

    See step  4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FUSE (PCU NO. 2) 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (DC/DC CONVERTER POWER SOURCE CIRCUIT) 

    See step  5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE MALFUNCTIONING PARTS 

    Result: 

    OK 

    See step  6

  6. CHECK AMD TERMINAL VOLTAGE 

    See step  6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK AMD TERMINAL CONNECTION CONDITION 

    See step  7

    Result

    Result Proceed to
    There are no arc marks. The terminal is connected securely and there are no contact problems. A
    There are no arc marks. The terminal is not connected securely and there is a contact problem. B
    There are arc marks. - C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE MALFUNCTIONING PARTS 

    Result: 

    A 

    See step  8

  8. CHECK GROUND WIRE CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY) 

    Refer to INSTALLATION [09/2022 - ]

    OK

    The ground wire is securely installed.

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) 

    See step  9

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT HYBRID VEHICLE CONTROL ECU 

    See step  10

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  11

  11. CHECK DC/DC CONVERTER FUNCTION 

    See step  12

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK HIGH VOLTAGE INSULATION 

    See step  14

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    See step  13

  13. CHECK GENERATOR HIGH-VOLTAGE CIRCUIT 

    Refer to Generator High-voltage Circuit [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  14

  14. CHECK MOTOR HIGH-VOLTAGE CIRCUIT 

    Refer to Motor High-voltage Circuit [09/2022 - ]

    HINT: 

    If the "Motor High-voltage Circuit" inspection results are normal, perform the next step.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL [09/2022 - ] 

  15. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY) 

    See step  15

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  16

  16. CHECK INVERTER WITH CONVERTER ASSEMBLY (AMD TERMINAL) 

    See step  16

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE FUSE (DC/DC) 

    Result: 

    NG 

    See step  17

  17. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (DC/DC) 

  18. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (DC/DC) 

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